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Business Acquisitions and Assets and Liabilities Held for Sale (Narrative) (Details) $ in Millions |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 18, 2019 USD ($) | Feb. 05, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) acquisition | Sep. 30, 2018 USD ($) | Oct. 29, 2019 USD ($) | Aug. 22, 2019 | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of business acquisitions | acquisition |  |  |  |  | 3 |  |  |  |  |
Acquisition consideration |  |  |  |  | $ 2,352.5 |  |  |  |  |
Goodwill | $ 1,424.9 |  | $ 10,746.7 |  | 10,746.7 |  |  |  | $ 9,346.8 |
Intangible assets acquired | 1,165.5 |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on disposal of business |  |  | $ 0.0 | $ 0.0 | $ 119.6 | $ 0.0 |  |  |  |
Disposal group, not discontinued operations | Gatan, Inc. |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred tax liability, book basis over tax basis |  |  |  |  |  |  |  |  | $ 10.0 |
Customer related intangibles |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets acquired | $ 1,005.3 |  |  |  |  |  |  |  |  |
Weighted average useful life of intangible assets acquired | 15 years 9 months 18 days |  |  |  |  |  |  |  |  |
Technology |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets acquired | $ 107.6 |  |  |  |  |  |  |  |  |
Weighted average useful life of intangible assets acquired | 6 years 9 months 18 days |  |  |  |  |  |  |  |  |
Thermo Fisher | Disposal group, not discontinued operations | Gatan, Inc. |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of shares agreed to be sold |  |  |  |  |  |  |  |  |  | 100.00%
Sale of business, consideration |  |  |  |  |  |  |  |  |  | $ 925.0
Teledyne | Disposal group, not discontinued operations | Imaging businesses |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of business, consideration |  | $ 225.0 |  |  |  |  |  |  |  |
Gain on disposal of business |  | 119.6 |  |  |  |  |  |  |  |
Gain on disposal of business, tax expense |  | $ 32.2 |  |  |  |  |  |  |  |
Subsequent event | AMETEK | Disposal group, not discontinued operations | Gatan, Inc. |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of business, consideration |  |  |  |  |  |  | $ 925.0 |  |  |
Foundry |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of shares acquired | 100.00% |  |  |  |  |  |  |  |  |
iPipeline |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of shares acquired |  |  |  |  |  |  |  | 100.00% |  |

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